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Claude Sonnet 4.5

claude-sonnet-4.5
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Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with... Built by Anthropic.

Prices updated

Input price

$3.00

per 1M tokens · Standard

Output price

$15

per 1M tokens · Standard

Input limit

1M

tokens

Output limit

64K

tokens

Input formats

TextImageVideoAudioPDF

Output formats

TextImageVideoAudioPDF
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Claude Sonnet 4.5 price history

2 price records since 9/25/2026

Claude Sonnet 4.5 cost calculator

Input20M tokens
Output5M tokens

$135/month

Standard pricing

    Overview

    What is Claude Sonnet 4.5?

    Claude Sonnet 4.5 is a text & reasoning and vision model from Anthropic. Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with... Its 1M context window and $3.00 input price make it a candidate for quality-focused production applications.

    Image understandingDocument analysisContent workflowsClassification

    Benchmarks

    Claude Sonnet 4.5 benchmarks & speed

    How Claude Sonnet 4.5 scores on standardized evaluations, and where it lands among every model we track.

    19.3

    Intelligence Index

    Better than 49% of 153 models

    42tok/s

    Output speed

    Better than 6% of 119 models

    1187

    DesignArena Elo

    Better than 43% of 81 models

    Reasoning

    GPQA Diamond

    72.7%

    Graduate-level scientific reasoning · top 68%

    HLE

    7.2%

    Humanity's Last Exam · top 69%

    Latency & design

    Time to first token
    1.09s
    DesignArena win rate
    51.5%
    Design battles judged
    45,440

    Independent scores from Artificial Analysis and DesignArena · updated 10/8/2026. Higher is better; ranks compare against every model we track with that score.

    Rates

    Claude Sonnet 4.5 pricing

    Pricing is based on token usage. Provider-specific caching, batch, regional, and tool charges may affect the final cost.

    Input · Standard

    $3.00

    Per 1M tokens

    Cached input · Standard

    $0.30

    Per 1M tokens

    Capabilities

    Claude Sonnet 4.5 Tools

    Tools available when using Claude Sonnet 4.5 through supported provider APIs.

    Function calling

    Supported

    Structured outputs

    Supported

    JSON mode

    Supported

    Reasoning

    Supported

    Built-in web search

    Not supported

    Log probabilities

    Not supported

    Deterministic seed

    Not supported

    Parallel tool calls

    Not supported

    Prompt caching

    Supported

    Strengths and limitations

    Strengths

    • Measured results (AA Intelligence 19.3 · DesignArena Elo 1187) position it for demanding production work.
    • 1M context supports large documents, repositories and extended conversations.
    • Supports text & reasoning and vision workloads in one model.

    Limitations

    • Generated tokens cost 5× more than input tokens, which matters for verbose responses.
    • Large context capacity does not guarantee consistent retrieval across the entire prompt.
    • Arena Elo and MMLU-Pro are directional; test accuracy, latency and reliability on your own workload before committing.

    Arena Elo, MMLU-Pro and pricing figures are illustrative; validate current vendor terms before purchase.

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    Frequently asked questions about Claude Sonnet 4.5

    Claude Sonnet 4.5 is a text & reasoning and vision model from Anthropic. Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...